On 6/18/21 11:00 AM, Matt DeVillier wrote:
> hi James,
>
> I've built working upstream coreboot images for both APL and GLK
> Chromebooks (reef and octopus boards respectively).
>
> Starting with a recovery image for the board you're working with,
> you'll need to extract the ifwi.bin, vbt.bin, fspm.bin/fsps.bin (GLK
> only; APL can use 3rdparty fsp repo), CPU microcode, and all audio/dsp
> blobs. use cbfstool for this. Then you'll need to set your config to
> use the extracted blobs / place them in the expected locations, set
> display init to FSP/GOP, and set the payload to Tianocore. Here's my
> defconfig for google/ampton (GLK) as an example:
>
> CONFIG_VENDOR_GOOGLE=y
> CONFIG_NO_POST=y
> CONFIG_IFD_BIN_PATH="3rdparty/blobs/mainboard/google/ampton/flashdescriptor.bin"
> CONFIG_BOARD_GOOGLE_AMPTON=y
> # CONFIG_CONSOLE_SERIAL is not set
> CONFIG_INCLUDE_NHLT_BLOBS=y
> CONFIG_INTEL_GMA_ADD_VBT=y
> CONFIG_INTEL_GMA_VBT_FILE="3rdparty/blobs/mainboard/google/ampton/vbt.bin"
> CONFIG_NEED_IFWI=y
> CONFIG_IFWI_FILE_NAME="3rdparty/blobs/mainboard/google/ampton/ifwi.bin"
> CONFIG_HAVE_IFD_BIN=y
> CONFIG_ADD_FSP_BINARIES=y
> CONFIG_FSP_M_FILE="3rdparty/blobs/mainboard/google/ampton/fspm.bin"
> CONFIG_FSP_S_FILE="3rdparty/blobs/mainboard/google/ampton/fsps.bin"
> CONFIG_CPU_MICROCODE_CBFS_EXTERNAL_BINS=y
> CONFIG_CPU_UCODE_BINARIES="3rdparty/blobs/soc/intel/glk/cpu_microcode_blob.bin"
> CONFIG_LOCK_MANAGEMENT_ENGINE=y
> CONFIG_PAYLOAD_TIANOCORE=y
>
> APL would be almost the exact same, but without the 3 FSP-related lines.
>
> cheers,
> Matt
>


Thanks very much for that.  Hmm - some questions:

My chromebook is the google octopus casta bluebird.  Running "cbfstool bios-casta.ro-11297-193-0.rw-11297-193-0.bin print" does not show any kind of ifwi.bin file.  Running "ifwitool bios-casta.ro-11297-193-0.rw-11297-193-0.bin print -d" only gives references to the components, those shown with "ifwitool -h", under "NAME should be one of:".  That's why I was asking about how to extract an ifwi.bin.

Did your Ampton recovery image include a distinct "ifwi.bin" file, by using cbfstool?

I'm building u-boot as the payload, instead of Tianocore, but I don't expect that that make any difference.

However, "cbfstool build/coreboot.rom print" does show a cpu_microcode_blob.bin file, built by coreboot.  I'm guessing that this microcode file is as good as the one in the recovery image?

The recovery image also has a vbgfx.bin.  I'm wondering if I should do something with this?  "make nconfig" fails to offer any gfx settings, though several gfx settings can be seen when manually editing the .config.

So, I'm stuck trying to understand sourcing this ifwi.bin file.  Any suggestions?

James



> On Fri, Jun 18, 2021 at 11:13 AM James Feeney <james@nurealm.net> wrote:
>>
>> Back in 2017 there was some brief discussion of how to compile coreboot for apollolake, with some uncertainty about the IFWI segment.  Does anyone know the current status of coreboot support for apollolake/geminilake?  In particular, to replace a Chromebook boot rom?
>>
>> The coreboot configuration options are confusing in the sense that the intended outcome of particular settings is not explained.  For instance, there is coreboot code compiled addressing the Intel FSP, but there are no FSP files generated in the resulting coreboot.rom.
>>
>> Working from a Chromebook bios upgrade image, it seems that many components might simply be copied from there, but then, there seems to be no tool to extract the complete IFWI segment from an existing bios image, except in pieces that would require reassembly.  Is there some way that an existing IFWI segment can be extracted and used in another compiled coreboot image?  Or, is there "security" code in the IFWI segment that will prevent a compatible working coreboot rom built in this way?
>>
>> James
>> _______________________________________________
>> coreboot mailing list -- coreboot@coreboot.org
>> To unsubscribe send an email to coreboot-leave@coreboot.org